In synonymy:
Phylloneta alpina (Giebel, 1867, T from Zygiella) = Phylloneta sisyphia (Clerck, 1757) (Levi, 1974a: 270, sub Theridion)
Phylloneta botezati (Roșca, 1935) = Phylloneta impressa (L. Koch, 1881) (Drensky, 1939a: 85, sub Theridion cornutum)
Phylloneta cincta (Walckenaer, 1841, T from Linyphia) = Phylloneta sisyphia (Clerck, 1757) (Walckenaer, 1847a: 485, sub Aranea notata)
Phylloneta cornuta (Yurinich & Drensky, 1917) = Phylloneta impressa (L. Koch, 1881) (Deltshev, 1992a: 17, sub Theridion)
Phylloneta frigicola (Chamberlin & Ivie, 1947) = Phylloneta impressa (L. Koch, 1881) (Levi, 1957a: 89, sub Theridion)
Phylloneta impressa intermedia (Kulczyński, 1885) = Phylloneta impressa (L. Koch, 1881) (Chyzer & Kulczyński, 1894: 33, sub Theridium)
Phylloneta nervosa (Olivier, 1789) = Phylloneta sisyphia (Clerck, 1757) (C. L. Koch, 1841a: vol. 8: 73, sub Theridium sisyphus)
Phylloneta notata (Linnaeus, 1758) = Phylloneta sisyphia (Clerck, 1757) (ICZN, 1959: 89)
Phylloneta qingzangensis (Hu, 2001, T from Theridion) = Phylloneta impressa (L. Koch, 1881) (Zhong, Liu & Zhu, 2022: 98)
Phylloneta sisyphia illepida (Caporiacco, 1934) = Phylloneta sisyphia torandae (Strand, 1917) (Bonnet, 1959: 4532, sub Theridium sisyphium torandae)
Homonym replaced:
Phylloneta lepida (O. Pickard-Cambridge, 1885) -- see Phylloneta sisyphia torandae Strand, 1917 Strand, 1917c